Check Release Note.
Linux 4.9 Images
NoteVIM3 Only support Ubuntu 20.04 for Linux 4.9.
Mainline Kernel Images
Only for SD/USB Installation.
NoteVIM3 Only support Ubuntu 20.04 for Mainline Linux.
EMMC InstallationImages used to be flashed to onboard eMMC via Amlogic USB Burning Tool.
Check Upgrade Via USB Cable Documentation.
SD/USB InstallationImages used to be flashed to SD/USB storage.
Check Boot From Ext Media Documentation.
Check Write SD Image To eMMC to write the image to onboard eMMC.